Fix typo in endpoint testing recipe

Author: timgates42

docs/recipes/endpoint-testing.md

@@ -2,7 +2,7 @@
 
 Translations: [Español](https://github.com/avajs/ava-docs/blob/master/es_ES/docs/recipes/endpoint-testing.md), [Français](https://github.com/avajs/ava-docs/blob/master/fr_FR/docs/recipes/endpoint-testing.md), [Italiano](https://github.com/avajs/ava-docs/blob/master/it_IT/docs/recipes/endpoint-testing.md), [日本語](https://github.com/avajs/ava-docs/blob/master/ja_JP/docs/recipes/endpoint-testing.md), [Português](https://github.com/avajs/ava-docs/blob/master/pt_BR/docs/recipes/endpoint-testing.md), [Русский](https://github.com/avajs/ava-docs/blob/master/ru_RU/docs/recipes/endpoint-testing.md), [简体中文](https://github.com/avajs/ava-docs/blob/master/zh_CN/docs/recipes/endpoint-testing.md)
 
-AVA doesn't have a built-in method for testing endpoints, but you can use any HTTP client of your choosing, for example [`got`](https://github.com/sindresorhus/got). You'll also need to start an HTTP server, preferrably on a unique port so that you can run tests in parallel. For that we recommend [`test-listen`](https://github.com/zeit/test-listen).
+AVA doesn't have a built-in method for testing endpoints, but you can use any HTTP client of your choosing, for example [`got`](https://github.com/sindresorhus/got). You'll also need to start an HTTP server, preferably on a unique port so that you can run tests in parallel. For that we recommend [`test-listen`](https://github.com/zeit/test-listen).
 
 Since tests run concurrently, it's best to create a fresh server instance at least for each test file, but perhaps even for each test. This can be accomplished with `test.before()` and `test.beforeEach()` hooks and `t.context`. If you start your server using a `test.before()` hook you should make sure to execute your tests serially.